You could use a dado blade on your table saw, would take you like 3-5 passes to cut that out CLEAN, or like the others said run your circular saw through it and chisel it out, OR if you have a really good chop saw(like i do) you can select the height of your blade to come down and run the wood back and forth and side to side and it will eat that notch out in a couple minutes.

I don't think he needs to cut 3" deep, just a 3" square piece of wood. Prob only 2" max he would need to cut. Still yet, jigsaw wouldn't be ideal for this, i agree with the above posters, circular saw set to the depth, make about a dozen or so cuts, hammer out the pieces, clean up with chisel.

You could use a dado blade on your table saw, would take you like 3-5 passes to cut that out CLEAN, or like the others said run your circular saw through it and chisel it out, OR if you have a really good chop saw(like i do) you can select the height of your blade to come down and run the wood back and forth and side to side and it will eat that notch out in a couple minutes.

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If he's asking the question. I highly doubt he has a table saw, much less a dado blade for it.

I don't think he needs to cut 3" deep, just a 3" square piece of wood. Prob only 2" max he would need to cut. Still yet, jigsaw wouldn't be ideal for this, i agree with the above posters, circular saw set to the depth, make about a dozen or so cuts, hammer out the pieces, clean up with chisel.

You could use a dado blade on your table saw, would take you like 3-5 passes to cut that out CLEAN, or like the others said run your circular saw through it and chisel it out, OR if you have a really good chop saw(like i do) you can select the height of your blade to come down and run the wood back and forth and side to side and it will eat that notch out in a couple minutes.